Water vapor permeance resistant silicone sealant and manufacture method thereof

A technology of silicone sealant and steam, applied in the direction of chemical instruments and methods, other chemical processes, etc., to achieve the effect of not harsh process requirements and equipment, simple process, and non-yellowing appearance

Active Publication Date: 2010-07-28
江苏明昊新材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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The applicant has also retrieved other relevant patent documents, for example, in the flame-retardant silicone structural sealant disclosed in CN1687288A and its manufacturing method and the intumescent flame-re

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  • Water vapor permeance resistant silicone sealant and manufacture method thereof

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Embodiment 1

[0031] A) prepare the base material, α, ω-dihydroxypolydimethylsiloxane 100 parts, methyl methacrylate 10 parts and preferably by the chemical composition of Changshu Institute of Technology, Jiangsu Province, China according to the weight ratio or weighing parts The brand LGHC-A type cadmium telluride mixed catalyst developed with the School of Materials Engineering and sold to the outside world is 0.5 parts of the catalyst A defined in the present invention, which is added to the vacuum kneader for kneading. The temperature is controlled at 120°C, the kneading time is controlled at 120min, and 110.5 parts of the base material are obtained;

[0032] B) To prepare the sealant, first prepare 110.5 parts of the base material obtained in step A) in parts by weight, polydimethylsiloxane with a viscosity of 0.5 to 20 Pa.s terminated by trimethoxysiloxy and at 25°C 50 parts of oxane, 50 parts of magnesium hydroxide modified by fatty acid, 60 parts of aluminum hydroxide modified by f...

Embodiment 2

[0034] A) Preparation of the base material, 100 parts of α, ω-dihydroxypolydimethylsiloxane, butyl acrylate, hydroxyethyl acrylate and 2-ethylhexyl acrylate by weight or parts by weight The three are altogether 11 parts according to the ratio of 4: 4: 3 (weight ratio), and the trade mark that is preferably developed by the School of Chemistry and Materials Engineering, Changshu Institute of Technology, Jiangsu Province, China and sold externally is the LGHC-A type cadmium telluride mixed catalyst, which is defined in the present invention. Add 0.6 parts of catalyst A to a vacuum kneader for kneading, the vacuum degree of the vacuum kneader is controlled to be 0.09MPa, the kneading temperature is controlled to be 110°C, and the kneading time is controlled to be 110min to obtain 111.6 parts of base material;

[0035] B) To prepare the sealant, 111.6 parts of the base material obtained in step A) is prepared in parts by weight, which is terminated by dimethoxysiloxy and has a visc...

Embodiment 3

[0037] A) Prepare the base material, mix 100 parts of α, ω-dihydroxypolydimethylsiloxane, methyl acrylate, ethyl acrylate, butyl acrylate and hydroxyethyl acrylate in parts by weight or parts by weight Those according to 3: 2: 4: 3 ratio (weight ratio) add up to 12 parts and are preferably developed by the School of Chemistry and Materials Engineering of Changshu Institute of Technology, Jiangsu Province, China and the brand that is sold externally is the LGHC-A type cadmium telluride mixed catalyst, which is the invention. Add 0.7 parts of the defined catalyst A into a vacuum kneader and knead. The vacuum degree of the vacuum kneader is controlled at 0.07 MPa, the kneading temperature is controlled at 115° C., and the kneading time is controlled at 130 minutes to obtain 112.7 parts of base material;

[0038] B) To prepare the sealant, firstly, 112.7 parts of the base material obtained in step A), polydimethylsiloxane terminated by dimethylmethoxysiloxy and having a viscosity o...

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Abstract

The invention relates to a water vapor permeance resistant silicone sealant and a manufacture method thereof, which belong to the technical field of polymer sealing materials. The water vapor permeance resistant silicone sealant comprises the following raw materials in parts by weight: 100 parts of alpha, omega-dihydroxydimethylpolysiloxane, 10 to 12 parts of acrylic ester, 0.5 to 0.8 part of catalyst A, 0.8 to 1.2 parts of catalyst B, 50 to 100 parts of dimethyl silicone polymer, 50 to 100 parts of magnesium hydrate, 50 to 100 parts of aluminium hydroxide, 3 to 6 parts of fumed silica, 11 to 15 parts of cross linker and 2 to 3 parts of silane coupling agent. The water vapor permeance resistant silicone sealant has the advantages of effectively inhibiting the permeance of water vapor (the permeance rate of the water vapor is less than 1), improving the flame resistance, producing no monomer separation phenomenon in the curing process and after curing, and having ideal weather resistance and corrosion resistance. The recommended manufacture method has simple process, few requirements on technique and equipment, and causes no pollution to the environment in the preparing process.

Description

technical field [0001] The invention belongs to the technical field of polymer sealing materials, and in particular relates to a silicone sealant which is waterproof and vapor permeable, and also relates to a preparation method of the silicone sealant. Background technique [0002] With the rapid development of the electronics industry, electronic equipment is developing in the direction of miniaturization, high capacity and high performance, and the high integration and ultra-thinning of electronic components have become a trend. It must be done. At the same time, since the water vapor in the atmosphere will cause corrosion to precision components and cause fires due to partial discharge and ignition in high-voltage places of electronic appliances; Performance requirements are getting higher and higher. The waterproof vapor transmission performance, flame retardancy and electrical properties of the adhesive are closely related to the structure and performance of the rubbe...

Claims

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Application Information

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IPC IPC(8): C09K3/10
Inventor 韩仁明王益昌费志刚
Owner 江苏明昊新材料科技股份有限公司
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